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Plasma Electrode Pockels Cell Subsystem Performance in the National Ignition Facility
The Plasma Electrode Pockels Cell (PEPC) subsystem is a key component of the National Ignition Facility, enabling the laser to employ an efficient four-pass main amplifier architecture. PEPC relies on a pulsed power technology to initiate and maintain plasma within the cells and to provide the necessary high voltage bias to the cells nonlinear crystals. Ultimately, nearly 300 high-voltage, high-current pulse generators will be deployed in the NIF in support of PEPC. Production of solid-state plasma pulse generators and thyratron-switched pulse generators is now complete, with the majority of the hardware deployed in the facility. An entire cluster (one-fourth of a complete NIF) has been commissioned and is operating on a routine basis, supporting laser shot operations. Another cluster has been deployed, awaiting final commissioning. Activation and commissioning of new hardware continues to progress in parallel, driving toward a goal of completing the PEPC subsystem in late 2007.
Date:
July 27, 2007
Creator:
Barbosa, F.; Arnold, P.; Hinz, A.; Zacharias, R.; Ollis, C.; Fulkerson, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Price Stability (Inflation Targeting) as the Sole Goal of Monetary Policy: The International Experience
None
Date:
July 27, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Public Transportation: Future Demand Is Likely for New Starts and Small Starts Programs, but Improvements Needed to the Small Starts Application Process
A letter report issued by the Government Accountability Office with an abstract that begins "Through the New Starts program, the Federal Transit Administration (FTA) identifies and recommends new fixed-guideway transit projects for funding. The Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) created a separate program, commonly called Small Starts, which is intended to offer a streamlined evaluation and rating process for smaller-scale transit projects. FTA subsequently introduced a separate eligibility category within the Small Starts program for "Very Small Starts" projects. These are simple, low-risk projects that qualify for a simplified evaluation and rating process. SAFETEA-LU requires GAO to annually review FTA's New Starts process. This report presents information on (1) FTA's fiscal year 2008 funding recommendations, (2) the extent to which the New Starts pipeline has changed over time, and (3) future projected trends for the New Starts and Small Starts pipelines. To address these objectives, GAO surveyed 215 project sponsors--78 percent of which responded--and interviewed FTA officials, 15 project sponsors, and 3 industry groups."
Date:
July 27, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Quantifying the importance of orbital over spin correlations in delta-Pu within density-functional theory
Spin and orbital and electron correlations are known to be important when treating the high-temperature {delta} phase of plutonium within the framework of density-functional theory (DFT). One of the more successful attempts to model {delta}-Pu within this approach has included condensed-matter generalizations of Hund's three rules for atoms, i.e., spin polarization, orbital polarization, and spin-orbit coupling. Here they perform a quantitative analysis of these interactions relative rank for the bonding and electronic structure in {delta}-Pu within the DFT model. The result is somewhat surprising in that spin-orbit coupling and orbital polarization are far more important than spin polarization for a realistic description of {delta}-Pu. They show that these orbital correlations on their own, without any formation of magnetic spin moments, can account for the low atomic density of the {delta} phase with a reasonable equation-of-state. In addition, this unambiguously non-magnetic (NM) treatment produces a one-electron spectra with resonances close to the Fermi level consistent with experimental valence band photoemission spectra.
Date:
July 27, 2007
Creator:
Soderlind, P & Wolfer, W
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 92, No. 222, Ed. 1 Friday, July 27, 2007
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 27, 2007
Creator:
Mattox, Jami
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Size Effect in Cleavage Cracking in Polycrystalline Thin Films
The reliability of polycrystalline thin films is essential to assuring safe performance of micro/nano-electromechanical systems. Usually, they are of through-thickness grain structures and are brittle at working temperatures, and therefore their fracture properties are dominated by the resistances offered by grain boundaries to cleavage cracking [1,2]. As a cleavage crack front propagates across a high-angle grain boundary, it would first penetrate across a number of break-through points [3], and the persistent grain boundary areas would then be separated through shear fracture or ligament bending [4,5]. It is, therefore, envisioned that as the film thickness is smaller than the characteristic distance between the break-through points, which is often in the range of 0.5-5 microns, the crack front transmission can be significantly confined by the film surfaces, leading to an either beneficial or detrimental size effect. That is, the fracture toughness of the polycrystalline thin film is not a material constant; rather, it highly depends on the film thickness. Since this important phenomenon has not received the necessary attention, we propose to carry out a systematic study on fracture resistances of bicrystal silicon films. The film thickness will range from 1 to 1000 microns, and the crystallographic orientations across the grain boundaries …
Date:
July 27, 2007
Creator:
Qiao, Yu
Object Type:
Report
System:
The UNT Digital Library
The Stability and Reversibility of Metallic Borohydrides
In effort to develop reversible metallic borohydrides with high hydrogen storage capacity and low dehydriding temperature, several new materials have been synthesized by modifying LiBH{sub 4} with various metal halides and hydrides. The investigation shows that the halide modification effectively reduced the dehydriding temperature through ion exchange interaction. The effective halides are TiCl{sub 3}, TiF{sub 3}, ZnF{sub 2} and AlF{sub 3}. The material LiBH{sub 4}+0.1TiF{sub 3} desorbs 3.5wt% and 8.5wt% hydrogen at 150 C and 450 C respectively. It re-absorbed 6wt% hydrogen at 500 C and 70 bar after dehydrogenation. The XRD of the rehydrided samples confirmed the formation of LiBH{sub 4}. It indicates that the materials are reversible at the conditions given. However, a number of other halides: MgF{sub 2}, MgCl{sub 2}, CaCl{sub 2}, SrCl{sub 2} and FeCl{sub 3}, did not reduce dehydriding temperature of LiBH{sub 4} significantly. TGA-RGA analysis indicated that some halide modified lithium borohydrides such as LiBH{sub 4}+0.1ZnF{sub 2} evolved diborane during dehydrogenation, but some did not such as LiBH{sub 4}+0.1TiCl{sub 3}. The formation of diborane caused unrecoverable capacity loss resulting in irreversibility. It is suggested that the lithium borohydrides modified by the halides containing the metals that can not form metal borides with boron are …
Date:
July 27, 2007
Creator:
Au, M.
Object Type:
Article
System:
The UNT Digital Library
A Steinberg-Guinan model for High-Pressure Carbon, Diamond Phase
Since the carbon, diamond phase has such a high yield strength, dynamic simulations must account for strength even for strong shock waves ({approx} 3 Mbar). We have determined an initial parametrization of two strength models: Steinberg-Guinan (SG) and a modified or improved SG, that captures the high pressure dependence of the calculated shear modulus up to 10 Mbar. The models are based upon available experimental data and on calculated elastic moduli using robust density functional theory. Additionally, we have evaluated these models using hydrodynamic simulations of planar shocks experiments.
Date:
July 27, 2007
Creator:
Orlikowski, D.; Correa, A.; Schwegler, E. & Klepeis, J.
Object Type:
Article
System:
The UNT Digital Library
Texas Register, Volume 32, Number 30, Pages 4611-4680, July 27, 2007
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
July 27, 2007
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
U.S.-Peru Economic Relations and the U.S.-Peru Trade Promotion Agreement
None
Date:
July 27, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
USDA Rural Housing Programs: An Overview
This report discusses the Department of Agriculture's (USDA) rural housing programs, which include loans for the purchase, repair, or construction of single-family housing; loans and grants to remove health and safety hazards in owner-occupied homes; loans and grants for the construction and purchase of rental housing for farmworkers; loans for the purchase and construction of rental and cooperative housing for the elderly and for rural residents in general; rental assistance payments to make rental housing more affordable; interest subsidies to make homeownership loans more affordable and to enable production of rental housing that is affordable for the target population; and loans for developing building sites upon which rural housing is to be constructed.
Date:
July 27, 2007
Creator:
Foote, Bruce E.
Object Type:
Report
System:
The UNT Digital Library
2010 Census: Redesigned Approach Holds Promise, but Census Bureau Needs to Annually Develop and Provide a Comprehensive Project Plan to Monitor Costs
Testimony issued by the Government Accountability Office with an abstract that begins "The U.S. Census Bureau (Bureau) estimates that the 2010 Census will cost over $11.3 billion, making it the most expensive in our history. The U.S. House of Representatives and Senate appropriation bills propose to reduce the Bureau's fiscal year 2007 budget request, raising questions about the Bureau's design of the 2010 Census and associated costs. Based on issued GAO work, this testimony addresses the extent to which the Bureau has (1) made progress redesigning its approach, including nonresponse follow-up, a key cost driver; and (2) developed a comprehensive project plan for the 2010 Census, as well as timely, detailed cost data for effective oversight and cost control."
Date:
July 27, 2006
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Afghanistan: Post-War Governance, Security, and U.S. Policy
This report considers the transition in government meant to stabilize Afghanistan. Moreover, the report discusses the new constitution and the benefits of it, such as women participating in politics. The report also discusses the NATO led troops in the region.
Date:
July 27, 2006
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
AIDS in Africa
Sub-Saharan Africa ("Africa" hereafter) has been more severely affected by AIDS than any other part of the world. Experts attribute the severity of Africa's AIDS epidemic to the region's poverty, women's relative lack of empowerment, high rates of male worker migration, and other factors. Health systems there are ill-equipped; AIDS' severe social and economic consequences are depriving Africa of skilled workers and teachers, and reducing life expectancy by decades in some countries. This report explains the AIDS crisis and surrounding issues in detail, as well as U.S. and international efforts to provide general and economic aid. Relevant U.S. legislation is also outlined.
Date:
July 27, 2006
Creator:
Cook, Nicolas
Object Type:
Report
System:
The UNT Digital Library
AIDS in Africa
This report discusses the AIDS issues in Africa and the Bush administration call to double U.S. international funding for AIDS.
Date:
July 27, 2006
Creator:
Cook, Nicolas
Object Type:
Report
System:
The UNT Digital Library
AIDS in Africa
Sub-Saharan Africa has been far more severely affected by AIDS than any other part of the world. The United Nations reports that 24.5 million adults and children are infected with the HIV virus in the region, which has about 11% of the world's population but more than 64% of the worldwide total of infected people. This report discusses this issue in detail, including the cause of the African AIDS epidemic, the social and economic consequences, response and treatment, and U.S. policy.
Date:
July 27, 2006
Creator:
Cook, Nicolas
Object Type:
Report
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 131, No. 9, Ed. 1 Thursday, July 27, 2006
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
July 27, 2006
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
ALE3D Rolling Simulations
Hot rolling is a problem involving large deformations during the process of turning an ingot into a thin sheet. As a result of the large deformations inherent in the process, significant amounts of energy are put into the ingot mechanically, most of which results in heat generation. Therefore, in order to predict the results of rolling both the mechanical and the thermal factors must accurately represent the real conditions. The factors which must be properly tuned include interface friction, mass scaling to decrease computation times, heat transfer at the interface, convective heat transfer from the ingot, and convective heat transfer from the roll. Since these parameters are generally not measurable the correct values must be derived by tuning the parameters so that solutions match some other measurable result. The interface friction will be tuned using an ALE3D input deck which has been set up to output the torque applied to the roll during the pass. The friction coefficient will be adjusted so that the computed torque matches the measured value. The various heat transfer coefficients are dependent on each other, and are tuned based on measured roll surface temperatures, ingot exit temperatures, and the energy input through the mechanical deformation …
Date:
July 27, 2006
Creator:
Riordan, T
Object Type:
Report
System:
The UNT Digital Library
d-alpha correlation functions and collective motion in Xe+Au collisions at E/A=50 MeV
The interplay of the effects of geometry and collective motion on d-{alpha} correlation functions is investigated for central Xe+Au collisions at E/A=50 MeV. The data cannot be explained with out collective motion, which could be partly along the beam axis. A semi-quantitative description of the data can be obtained using a Monte -Carlo model, where thermal emission is superimposed on collective motion. Both the emission volume and the competition between the thermal and collective motion influence significantly the shape of the correlation function, motivating new strategies for extending intensity interferometry studies to massive particles.
Date:
July 27, 2006
Creator:
Verde, G.; Danielewicz, P.; Lynch, W.; Chan, C.; Gelbke, C.; Kwong, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 108, No. 101, Ed. 1 Thursday, July 27, 2006
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 27, 2006
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Analysisi Benchmark of the Single Heater Test
The Single Heater Test (SHT) is the first of three in-situ thermal tests included in the site characterization program for the potential nuclear waste monitored geologic repository at Yucca Mountain. The heating phase of the SHT started in August 1996 and was concluded in May 1997 after 9 months of heating. Cooling continued until January 1998, at which time post-test characterization of the test block commenced. Numerous thermal, hydrological, mechanical, and chemical sensors monitored the coupled processes in the unsaturated fractured rock mass around the heater (CRWMS M&O 1999). The objective of this calculation is to benchmark a numerical simulation of the rock mass thermal behavior against the extensive data set that is available from the thermal test. The scope is limited to three-dimensional (3-D) numerical simulations of the computational domain of the Single Heater Test and surrounding rock mass. This calculation supports the waste package thermal design methodology, and is developed by Waste Package Department (WPD) under Office of Civilian Radioactive Waste Management (OCRWM) procedure AP-3.12Q, Revision 0, ICN 3, BSCN 1, Calculations.
Date:
July 27, 2006
Creator:
Wade, H. M.; Marr, H. & Anderson, M. J.
Object Type:
Report
System:
The UNT Digital Library
Archer County Advocate (Holliday, Tex.), Vol. 4, No. 16, Ed. 1 Thursday, July 27, 2006
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
July 27, 2006
Creator:
Stevens, Charlotte
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 248, Ed. 1 Thursday, July 27, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
July 27, 2006
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Bovine Spongiform Encephalopathy (BSE, or “Mad Cow Disease”) in North America: A Chronology of Selected Events
None
Date:
July 27, 2006
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library